3 Answers
3

You access the DLCs from the Teleport menu and can completely ignore them until you want to play them. However Mad Moxxie's DLC gives you instant access to a bank to store items in (GREAT for keeping spare guns/COMs) and Knoxx's Armory DLC boosts the level cap by 10 levels just by installing it.

You don't have to play these DLCs at all to get these benefits, though you do have to enter Mad Moxxie's area to store items in the bank, but there are no quests that you have to do to get the bank. You can warp to Moxxie's underdome and store items immediately.

That's a great answer. There's no reason not to install the DLCs right away, if I can just "skip" them until I have completed the main game. Also, having access to the bank will be great. I will definitely have a look at that. I just tried to install the DLCs. They are lying under "My Games" as "Expansion Pack" without an image and I can't really seem to launch this "Expansion Pack". Will I just put on the "main game" disc and play from the install of the main game? I doubt that the games are installed correctly as the menu screen still says "New DLCs available" or something similar.
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SimonBSMar 12 '12 at 6:07

No disadvantages are risen from downloading before the completion of the main game.

But at the same time, you cannot download while playing the game, and they will take their time to download...

I would recommend that you download them while not being active on the xbox, this could include while in the shower, sleeping or even going to the shops, it will add up even if its a few minutes, sure it would be better to do it in one sweet session, but i doubt that will happen.

There is nothing to be gained by not installing DLCs before completing the game, and some of them raise the level cap, so it's best to install them immediately after the game itself has been installed.